Brake-shoe.



No. 735,426. PATENTED AUG. 4, 1903.

J. S. THOMBSON.

BRAKE SHOE.

APPLICATION FILED APR. 14, 1903.

N0 MODEL.

2 SHEETS-SHEET 1' By W Any PATENTED AUG; 4, 1908.

' J.- s. THOMPSON.

BRAKE SHQE. APPLICATION FILED APR. 14, 1903.

NO MODEL.

2 SHEETS-SHEET 2- //7 1 677 fo r m2 Nmims PETERS in. Pnmuuwc mam-man, o c.

I UNITED STATES Patented August 4, 1903.

ATENT Fries.

AMERICAN BRAKE snona FOUNDRY COMPANY, A CORPORATION on NEW JERSEY.

BRA

OF NEW YORK, N. Y.,

SPECIFICATION forming part of, Letters Patent No. 7 35,426, dated August 4, 1903.

Application filed April 14,1903.

To all whom it may concern:

Be it known that I, JAMES SHIELDS THOMP- SON, a citizen of the United States, residing at Chicago Heights, in the State of Illinois, have invented certain new and useful Improvements in Brake-Shoes, of which the following is a specification. Myinvention relates to the wearing-blocks or brake-shoes commonly used upon railway- Io 'car brakes, and particularly to that class of shoes which is provided with a reinforced back, and also to such backs as used in conjunction with hard metallic inserts in the fac of the shoe.

The objects of the invention are to provide a malleable-metal reinforcement on the back of a cast shoe of improved form and cheap in construction, to provide such a backing as will distribute the quantity of the metal in the insert economically with relation to the weak points of the shoe, to provide a malleable backing for the shoe which is made of common cheap commercial forms of iron and easily placed accurately inits place inthe 2 5 shoe, to provide an improved mode of attachment of a malleable backing to the insert in the face, and to improve the rigidity of the kind of insert known as the grid insert in the. face by means of its connection with the. backing, and to generally cheapen and strengthen the construction of compositemetal brake-shoes. These objects, together with other advantages which will hereinafter appear, I attain bymeans of the construction and arrangement of parts as illustrated in preferred forms in the accompanying drawings, wherein- Figures 1 and2 are respectively a side elevation and a plan of a brake-shoe having my improved backing indicated by dotted lines and connected with a grid insert in the shoe. Fig. 3 is a cross-section. of the shoe, taken on the line 3 ofFig. 1. Fig. 4 is an under plan view of abrake-shoe having a different form of grid insert and the backing indicated as connected therewith in dotted lines. Fig. 5 is a cross-section of the shoe illustrated in Fig. 4, taken on line 5 therein. Fig. 6 is a section taken along the line 6 6 of Fig. 7 and Serial No. 152,550. N m d L illustrating a modified form of backing in which I use rods of Wavy contour. Fig. 7 is a side elevation. Fig. 8 is an under plan of a shoe, showinga modified form of open-grid insert.

The combination of several qualities of metal in the manufacture of brake-shoes has two principal functions-namely, to provide in the face of the shoe for both the hardness and durability of cast-iron combined with the increased frictional resistance of the soft iron and to provide upon the back of the shoe a other.

I prefer to make the inserted rods 70f halfround iron commonly found in themarket, thetwo rods beingof the samelength andone of them being offset or indented in the center, as aforesaid. They may be either straight or preferably wavy in contour 14, as in Fig. 6, and may be wholly or only partly embedded beneath the surface of the back of the shoe, the shape of the rod enabling it to hold firmly in the shoe by reason of its dovetailed crosssection. Generally this form of backing is used in connection with a grid insert in the face of the shoe, and the grid 10 may when desired he formed with an upwardly-projecting end 9, and the ends of the rods 7 may be embedded therein in order both to strengthen the grid and to thoroughly anchor the rods in the shoe-body, as in Fig. 1; otherwise the rods may be placed in open slots 16 in the ends 9 instead of casting them therein.

In Figs. 4 and 5 I have illustrated an improved form of grid insert which has curved sides, a center stay 13, and cross-bars at its ends 12; but I prefer the form of grid insert 15 shown in Fig. 8 without the central cross-bar. These end bars 12 in Fig. 4-;are extended upward enough to allow the insertion of the outer ends of the rods 7 therethrough when desired. This construction, it will be observed, provides diagonal braces for the grid insert and greatly strengthens the shoe against sidewisebreakage when it strikes the flange of the whee]. The binding together of the grid insert and the malleable backing in this manner also insures the entire shoe from breaking apart and greatly strengthens the backing, so that a shoe having an insert in its face may not be weakened, but will be even stronger than if it were solid cast all through. i

It will be understood that in case the grid inserts 10 and 11 are made of hard cast metal, as usual, the rods 7 may be inserted in. place in the upturned ends 9 and 12 at the time the grid is cast. Then the rods and the grid, together forming the skeleton strengtheningframe of the shoe, may be placed in a common sand mold and the metal poured therein to form the complete shoe; but for cheapness the rods may be merely placed in slots in the end bars 9, as in Fig. 6'. The many advantages in thus strengthening both the grid insert and the backing and the entire shoe and the insurance of safety from falling apart of the pieces in case the shoe is broken will readily appear from inspection of the drawings. The wavy form of Fig. 6 very much improves the hold of the rods in place in the shoe and renders it unnecessary to anchor them at the ends.

Having thus described my invention and illustrated its use, what I claim, and desire to secure by Letters Patent, is the following:

1. Abrake-shoe havingabacking composed of two rods diagonally arranged on the rear surface of the shoe and attached to an insert in the face of the shoe.

2. A brake-shoe having a reinforced back composed of rods arranged diagonally of the shoe and crossing each other at the center, one of said rods being recessed so that the two rods may lie in essentially the same plane along the length of the shoe.

3. A brake-shoe provided with a reinforcement in the back composed of two rods crossing each other and arranged diagonally in the shoe.

4. A brake-shoe provided with a reinforced backing composed of rods diagonally arranged, crossing each other near the middle and with their ends buried in the body of the shoe, substantially as described.

5. In a brake-shoe the combination with a grid insert in the wearing-face of the shoe having an upwardly-projecting end, of a malleable-metal backing composed of rods embedded near the back surface of the shoe and having their ends anchored in parts of the grid insert, substantially as described.

6. In a brake-shoe the combination of an insert of general grid or closed'figure-form and a malleable-metal backing composed of rods having their ends anchored in the said grid, substantially as described.

7. In a brake-shoe the combination with a closed-figure insert in the face of the shoe having cross-bars at the ends thereof, of a malleable-metal backing of the shoe consisting of rods running diagonally of the shoe, buried in the cast metal near the back, and having the ends of said rods embedded in the metal of the insert in the face, substantially as described.

8. In a brake-shoe the combination of a hard cast-metal closed-figure insert embedded in the wearing-face of the shoe, of a malleable-metal backing for the shoe composed of two half-round rods embedded near the back of the shoe and having their outer ends embedded in the metal of the insert in the face, substantially as described.

In testimony whereof I have hereundersigned my name in the presence of the two subscribing witnesses.

JAMES SHIELDS THOMPSON. WVitnesses:

PAUL CARPENTER, EDWARD O. BURNS. 

